Astronomers raised hopes that humanity might not be alone in the universe by announcing on Thursday they have detected the ...

and a guide to all the Easter eggs from previous Alien films you might have missed. There's also a feature called 'Alien: A Conversation,' which sees Alvarez and Ridley Scott sit down for a chat ...

But if aliens were building their own society, would they have to go down the same path as humanity, relying on fossil fuels to build their advanced civilization? Or could they find an alternative?